15 Apr
2009
15 Apr
'09
2:56 p.m.
And waht
behaviour is that? Can you do anything from the front panel, for
example?
Ah, sorry - got lost in earlier threads. I get a few seemingly random
lights on the front panel -- always the same ones, though:
The "Run," "Bus," "User," and "Console" status
lights are always lit, as
are bits 17, 10, 8, and 7 of the address, and bit 14 of the data.
The console is completely unresponsive, nothing has any effect. I trick I
commonly use if I don't have the right extender card is to pull
the board I want to work on and solder lengths of wire to useful points
on that PCB. Then put the board back in place, make sure the wires aren't
shorting to anything and then power up. I can then connect my test gear
to the free ends of the wires.
If I was as good at this as you, then that might work for me :). As it
is, I'm hoping that once I get some extender
boards I can start
debugging with my logic analyzer and learn how to work on this machine
as I go along.
There's no doubt that exteneder boards are very useful (why else would I
have a set :-)), but it is possible to manage without them. Don't let the
lack of an extender board act as an excuse for not getting this amchine
going!
It's slower than using an extender card, of
course, but typically I only
need 2 or thre 'goes' (pull board, solder on half a dozen wires, put it
back, test) to find the fault.
Can I fly you out here to fix mine? :)